Which policy promotes efficient energy use in Power Supply Units (PSUs)?

The correct answer is 80 Plus, which refers to a certification program designed to promote efficient energy use in Power Supply Units (PSUs). This program establishes specific efficiency standards that PSUs must meet in order to qualify for the certification. The goal of 80 Plus is to encourage manufacturers to create products that not only consume less electricity but also produce less heat, leading to increased overall efficiency. A PSU that achieves an 80 Plus certification guarantees that it will convert at least 80% of the AC power it draws from the wall into usable DC power for the computer, which is a significant benchmark in promoting energy-efficient technology.

While the other choices pertain to energy efficiency and environmental responsibility, they do not specifically target the efficiency of Power Supply Units. The Green Initiative encompasses a broader range of environmentally friendly practices across various sectors, Energy Star focuses on a wide variety of household and office products, and Renewable Energy Standards are regulations that promote energy produced from renewable sources, rather than emphasizing the efficiency of specific components like PSUs. Therefore, 80 Plus directly addresses energy efficiency in this context.